TANK APPLICATIONS

•Precastpost-tensionedconcreterectangularstructuresmanufacturedbyDutchland,Inc.areproducedforavarietyofwastewatertreatmentprocesssystems,includingSequencingBatchReactor’s,ExtendedAeration,OxidationDitches,andMembraneBio-Reactor’s.TypicalwaterpurposesincludePotableWaterTanks,FireProtectionTanksandmore.

•Dutchland,Inc.producesdesign/buildextendedaerationwastewatertreatmentplants,utilizinghighqualityequipmentandcompleteprocessdesigns. Additional information is available for extended aeration plants designed and manufactured by Dutchland, Inc.

TYPICAL INSTALLATION

•PrecastconcreteelementsaremanufacturedataPrecast/PrestressedConcreteInstitute(PCI)certifiedfacility.

•Precastconcreteelementsaresetonapoured-in-placeslabwithinareceivingkeyway.Alignmentischeckedwithlaserequipment.

•Temporarypropsareattachedtotheinnerfaceofthetankandsecuredtothebase.Top-of-wallbracketsplacedatthepaneljointsinsurepanelalignment.

•Tendonsarethreadedintotheductsandpartialtensionisappliedtoalltendons.

•Walkwaysaresetintoplaceandpartialtensionisapplied.

•Jointgroutispumpedintothejointcavities.

•Finaltensioningisappliedtoalltendons.

•Basetowallelastomericsealantsareapplied.

•Structuresarecheckedtoinsureforwater-tightness.

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RECTANGULAR TANKS

STRUCTURAL SUPERIORITY

•Exteriorandinteriorwallsaretypicallydesignedforfullwaterloadononesideandemptyontheotherside,unlessotherwisespecified.TanksaredesignedinconformancewithACI318andACI350.

•Precastpost-tensionedtankscanbeconstructedaboveground(withthebaseslabbelowfrost),completelyburied,orpartiallyout-of-grade.Tankscanalsobedesignedtowithstanddifferentialbackfill.

•Post-tensionedwalkwaysprovideastructuralupperfixedbeam.Withouttheneedforconventionalcantileverdesignrequirements,thewallthicknessofdeepstructuresisreduced.

•Thefootprintisgenerallymuchsmallerduetodeeperwallsandcommon-wallconstruction.

DURABILITY

•Allwallpanelsaresolid(notbuiltinaddedlayers).

•Allwallsarecasthorizontallyinsteelforms,providinganextraordinarilydenseandimpermeablemember.Spallingandsurfacedefectswhichistypicallyassociatedwithcast-in-placeconcreteisvirtuallyeliminated.

•Maintenanceassociatedwithsteeltankage(dewatering,sandblasting,repainting)isnotrequired.

•Exteriorcoatingsarenotrequired.Penetratingstainsordecorativecoatingsareavailableuponrequest.

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1. CAST-IN-PLACE POST-TENSIONED BASE SLAB (optional)

Post-tensioned base slabs are cast on-site. Post-tensioned base slabs are in compression, eliminating cracking.

•Reinforcementisplacedwithinthebaseform.•Post-tensioningtendonsareplacedwithintheformwork.•Keywayformsareplacedandcheckedforelevationanddistancefromcenterofthetank.

•Concreteisplacedinacontinuousmonolithicpourandsteeltrowelfinished.•Theformsareremovedandthebaseiscoveredorsprinkledwithwatertoachievepropercuring.

•Initialpost-tensioningisappliedafterapproximately20hoursbyPost-TensioningInstitute(PTI)certifiedpersonnel.

•Finalpost-tensioningisapplied,uponconcreteachieving75%ofdesignstrength.•Tendontailsareremovedandtheanchorpocketsarecleaned,primedandfilledwithgrout.

2. TANK WALL PANEL INSTALLATION

Conforming to the AWWA D-115 standard, all production and installation procedures insure a high quality tank system.

•Bearingpadsandshimsareplacedinthekeyways.•Wallpanelsareliftedbyacraneandsetintoplace.Alignmentischeckedwithlaserequipment.

•Temporarypropsareattachedtotheinnerfaceofthewallpanelsandsecuredtothebase.

•Tendonductextensionsareplacedandsealedbetweenthewallpanels.•Tendonsarethreadedintotheducts.•Verticaljointsareformed.Groutispumpedintothejointcavityandconsolidated.•Circumferentialpost-tensioningisadministeredbyPTIcertifiedpersonnel.•Expandinggroutispumpedintothetendonducts,topermanentlyencasethetendonsandcreateabondtothetankwalls(bondedtendontankoption).

•Anelastomericsealantisusedtosealthebasetowallconnection.•Thetankisheldinconstantcompressionbytheencasedpost-tensionedcables.

*Tanksareavailableinbondedtendonandnon-bondedtendondesigns.

CIRCULAR TANKS

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4. THE FINISHED PRODUCT

The finished product consists of a precast post-tensioned concrete tank designed for longevity with virtually no maintenance.

A no hassle ten-year structural warranty covers the base, wall, and roof systems of all post-tensioned tank structures manufactured and installed by Dutchland, Inc.

•Allwallpanelsaresolid(notbuiltinaddedlayers).•Allwallsarecasthorizontallyinsteelforms,providinganextraordinarilydenseandimpermeablehighstrengthconcreteexterior.Thepotentialforspalling,typicallyassociatedwithshot-creteorcast-in-placeconcrete,isvirtuallyeliminated.

•TanksmanufacturedbyDutchland,Inc.do notrequireasteeldiaphragm,orexteriorcoatingsforwater-tightness.

•Norepaintingorshot-cretemaintenanceisrequired.•Exteriorcoatingsarenotrequired.Penetratingstainordecorativecoatingsareavailableuponrequest.

•Theresultisanocompromise,costcompetitivetankmanufacturedandconstructedinaccordancewithAWWAD-115standard.

3. ROOF AND SUPPORT SYSTEM INSTALLATION

Multiple tank cover designs are available, including precast concrete sloped roof systems, precast concrete domes, and aluminum geodesic domes.

•Precastconcretesectionsareliftedintoplace.•Post-tensioningtendonsareinsertedintothetendonducts.•Circumferentialpost-tensioningisadministeredbyPTIcertifiedpersonnel.•Excesstendonisremoved,capped,andsealedoff.•Polyurethaneelastomericsealantand/orClosedCellFoamGasketareappliedattheroofjointstoinsurewater-tightness.

ELLIPTICAL TANKS

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1. CONSTRUCTION

•Ellipticaltanksareconstructedwithmethodssimilartoprecastpost-tensionedrectangularandcirculartanks.

•Ellipticaltanksincludebase,wallsandwalkways.

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2. BENEFITS

•Roundedtankendsareeasiertofabricatebyutilizingprecastratherthancast-in-placeconcrete.

•Lesstimeisgenerallyrequiredinconstructionforprecastconcretethancast-in-placeconcrete.

•Variousconfigurationsareavailabletomeettherequirementsofspecificequipmentsuppliers,includingbutnotlimitedto;Kruger,SiemensandEimco.

•Dutchland,Inc.typicallyworksdirectlywiththeequipmentmanufacturerduringthedesign/submittalphasetoensurecompatibility,resultinginbettercoordination.

Dutchland,Inc.alsospecializesindesigningandbuildingextendedaerationwastewatertreatmentplants.BNR(BiologicalNutrientRemoval)fornitrogenandphosphorusdesignsincorporateMLEconcepts.TertiarytreatmentforlowBOD/TSSisoptional.

Additional information is available upon request for Custom-Designed Wastewater Treatment Plants.

DUTCHLAND, INC. FACILITY

PRECAST MANUFACTURING FACILITY

ABOUT DUTCHLAND, INC.

•Dutchland,Inc.isaPCIcertifiedprecastconcretemanufacturingfacilitywithACIcertifiedQualityControlpersonnelandPTIcertifiedinstallationpersonnel.

•PrecastconcreteismanufacturedinLancasterCountyPennsylvaniaanddeliveredtothejobsite.

•Dutchland,Inc.specializesinmanytypesofprecastpost-tensionedconcretestructures,includingcircular,rectangular,andellipticalstructures.

•Dutchland,Inc.surveysallcustomers.100%ofcustomerssurveyedindicatedtheywouldcontractwithDutchland,Inc.again.

REASONS TO CHOOSE PRECAST POST-TENSIONED TANKS (PPT’s)

1.PPT’sutilizesuperiorconstructionmethods,andhavea10-yearnonpro-ratedwarranty.

2.PPT’sareeasilydesignedforavarietyofuses,includingwaterstorage,wastewatertreatment,stormoverflow,effluentstorage,andmanyotherpurposes.

3.PPT’sarevirtuallymaintenancefreefordecadesandaredesignedtostayincontinuousservice,eliminatingcostlymaintenanceanddowntime.

4.PPT’scanbeconstructedaboveground(withthebaseslabbelowfrost),completelyburied,orpartiallyout-of-grade.

5.MinimalsitespaceisrequiredforPPTconstruction,resultinginlesssitework.Insomecases,PPT’scanbeconstructedagainstexistingstructuresorbuildings.

6.WallpanelsandotherPPTkeyelementsaremanufacturedinaclimatecontrolledproductionfacilityratherthanonsite.

7.LesstimeistypicallyrequiredtoconstructPPT’scomparedtoconventionalcast-in-place.

8.Additionalinformationisavailableaboutpost-tensioninguponrequestoratourwebsite:www.dutchlandinc.com